#header-nav {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  i {
    margin: 12px 394px 12px 0;
  }
  ul:after {
    content: ' ';
    display: block;
    clear: both;
  }
}
.nav-items {
  border-bottom: 1px solid transparent;
  cursor: pointer;
  position: relative;
  font-size: 18px;
  float: left;
  margin-right: 38px;
  padding-bottom: 12px;
  a {
    color: #666666;
  }
}
.nav-items::before {
  content:"";
  position:absolute;
  top:0;
  width:0;
  height:100%;
  border-bottom:1px solid #eb8c27;
  transition:150ms all linear;
}
.nav-items:hover::before {
  width:100%;
  top:0;
  transition-delay:100ms;
}